Calculator tests error

Good day! I do my calculator tests (https://codepen.io/igor-sushko/pen/GavegE?editors=0010) and find this in #14

s.assert.strictEqual(te(document.getElementById("display")),"13",'The sequence "5 + 3 = + 3 =" should produce an output of "13" ')

but the answer should be 11.

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